1890545 has 8 divisors (see below), whose sum is σ = 2282280. Its totient is φ = 1503360.

The previous prime is 1890541. The next prime is 1890547. The reversal of 1890545 is 5450981.

It can be written as a sum of positive squares in 4 ways, for example, as 73441 + 1817104 = 271^2 + 1348^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1890545 - 2² = 1890541 is a prime.

It is a super-3 number, since 3×1890545³ = 20271333203380885875, which contains 333 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1890541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 140 + ... + 1949.

It is an arithmetic number, because the mean of its divisors is an integer number (285285).

2^1890545 is an apocalyptic number.

It is an amenable number.

1890545 is a deficient number, since it is larger than the sum of its proper divisors (391735).

1890545 is a wasteful number, since it uses less digits than its factorization.

1890545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2275.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 1890545 is about 1374.9709087832. The cubic root of 1890545 is about 123.6504419817.

The spelling of 1890545 in words is "one million, eight hundred ninety thousand, five hundred forty-five".